# Relationship history for MSHA mine 4607272

Current hierarchy: **Hall Dale → Elk River Resources → Red Oak #1 Auger Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** E F A Inc → Red Oak #1 Auger Mine; 1987-03-01 to 1987-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Carpenter M Wesley → Red Oak #1 Auger Mine; 1987-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Carpenter M Wesley → E F A Inc; 1987-03-01 to 1987-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Elk River Resources → Red Oak #1 Auger Mine; 1987-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hall Dale → Red Oak #1 Auger Mine; 1987-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hall Dale → Elk River Resources; 1987-10-23 to current/open; source msha-controller-operator-history